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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a94213a231e60b300482e0b53d2a888df9c97ce90b3001204937a2befae3674d' 
  AND token = 'WzJfQdRfubTFYLu81HAr02ngqEvJQYthVbarF4rR2DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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