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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7caf6894d922b4f2688660eb576b440f47293cc40ac97736294909f2a856ffba' 
  AND token = 'KOhBssTkrArjF5FHFSB9fel0WxR3CZ/JeYfFLubEDm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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