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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b59efe4a829a1ad5ca0d642419f25b6755c776fb4d61e051fc642ebaa2198c4a' 
  AND token = 'NpGoiTs8Ok7bYEthd9g2/CGLOPSmpIsW5oMqyE4WukU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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