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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e41197384083c15a07469023aa33e984ca0e093e1d59247f4f97424d1b60cb68' 
  AND token = '0qLXR4GlUzS1pJyPbLHj7j1Bq1HtM0pfDoLjvVgjxaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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