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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7087bc2dbbc27b1ad5c356e171dbd03e03c563d7bec948fd0bfd57d76dc4f8f' 
  AND token = 'xRZaJn1TbhozyqNvDdO+DPWLoSc0XmuK925n4NY3PTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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