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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e8db8cf75dcc9cbfd93dfa8c0a8074797a9be2306a8878ddfeb0dcd5e7dd022' 
  AND token = 'Bq/evSwikqRy9oMn8R4N/lWx9sWGk2Sb9FiFP7TL7Zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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