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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ca481e979d7e48f63152949a34e9af376e3ad077deb4dcba2710974457c8b36' 
  AND token = 'XjHlgz1u/Z7IkCLQOTI/xl0uDH008cNIJjXWDqplsKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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