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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd750a5cf62f8eaa2d72ee7ab0a5f9c7ee31e5d1101ebf50cdd92ab61c44dc23f' 
  AND token = 'W5J69m4vCHI+XQ904zPfwOAxnLTow4CuV1J3qqGjvdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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