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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbf618b16d919c0c9cda9c1ee6937d38712151d4195f7bcc2b9a1b12f3b7f78b' 
  AND token = 'j7NLaWOWBfJcDanZHYc5xu74bGZeKWJIOs321HLQcOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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