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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1944175d241088fffc51acf3d90234ddf9dae92bc6c351be8bcef6409141c74' 
  AND token = '8fYuDrhTNwVx6OQvW1vql+0YA9/O+1UrXyivtrSLhvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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