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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe993b9aefd9eab73f9fccec8aa0e607a6ffb83714ce6e53902c9e087c40bb8b' 
  AND token = 'M3awL/DvgUZ0UiD2PYbhKq/L6r/ROP5LlIaWBBd4X8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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