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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8903b090947995b7cd93ce52d8e93aefd1efe1fa8f724cacba2e06b8bade3bb' 
  AND token = 'yt7/RsI4VPAU2Ee1jC6wXvlcjij0ZyrcdPaHeiUy1Rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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