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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb6da729adfeca4f9d93b309b12f147a4c8f5a84333df88dc14d00be5e90584d' 
  AND token = 'PQgeCZ/bI0iZ/O9GlKqRx1AKIuXPhOsU0o2LVtUhTg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}