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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '509fce9e1cc7726f1220a8bddc956d1e2fd878502c1104af823a4b3d6edd57a7' 
  AND token = 'av9SdVl6L786f6y7ZkFLqbO+xp07LGExWyB6ILMyPyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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