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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1056de24d2848d4ed4f50c5f8e4cca55c15df540552a642f1cc2c9655905b4da' 
  AND token = 'YjoFKyjqCjrLPwIBggLc7qfrXLqg/sGu+A0yylxtaxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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