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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2a58b0473c9debb9a29537991500ef01ea2b599f1845c002636931edc67b51f' 
  AND token = 'IkVXugkAwAfLI9hEPEdnp4lNMuwp7Fvuzv7wM87tbcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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