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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '572654d1c2e2cf83dc4faad737792085f192e486f1d911835930b39a4a453d4c' 
  AND token = 'KDJZGYZxTeIj9dd4gHaBc27e9cUS+ndKYEti/GdFdMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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