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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5ba28245a231448902a30b43889b7c8f998efafd0189016a81c2bc71c8cf609' 
  AND token = '9vs731nMmKsgSfrC2p+NoiJ3Yj2Zqsu7CvDv+0fYwys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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