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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c3c1cf1cc89a251771c5ac839cae50e35814b68ced815c3ca558011c3dea3f5' 
  AND token = 'ZlZux6B4EfoxeqzrxsqQJRtGr/HZ3IPIHgqWeZJ7k7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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