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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66ed19d418b8765cbeab5fb19fddb880a89fec429ed7b66b62ec06abacdb4cfc' 
  AND token = 'ifbxKYH0RXli8UslIDUD7rIHUy0dZERMBItAxBVgTjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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