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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1e3f3539b451968b106d8ec606244154f1b2f1f088b3f7d85a6467f8b248ada' 
  AND token = 'SJB2UonA3AhSra0r/sctW9Ywkf4ARSlsOa713OOht+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00123

JSON explain

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