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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46a4d410465c013a9679c3f1096d13e4321f0cb8ef8ef283af2c43010f4cd3af' 
  AND token = 'NWgAhOeYxnxLyYTsZ5Kpwrri8Mo2QLjERRhinXJYKIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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