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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb288cfc59a166687add75af042e592c4a32c6abcbee85e762119569df8ddb70' 
  AND token = 'ErruEb10FoHYzJ/cvWA0qF8Tmadw7aY8Y1vV5eljZ6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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