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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a55dc192b125bc0642e61ad336f29d4b762373c766acae9e38e55bb731067767' 
  AND token = 'E3mb32vSuNHct3HUdWFwfJCgN9W45VOpXGSa1HGChl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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