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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '513c0a738a68a6e936ccb12d39b71dcbd84ddf4a36fb3316bf79427560c93051' 
  AND token = '0KsGiYWuc28F9k1KGArnaMP6LwPiFqcKtjBvDXPJfl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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