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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c18ee77f8b49d67981dfc5d784e557d2b9590f4d417dc38588004279270ee420' 
  AND token = 'BUdtBj3gHrC0HpUkmVqTzsD2v1vnEtBiGpkAyGo/+vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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