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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c549ed9b6c3de4133304586a382cee425bbbb118bba9b3f1683dbb2db55615b' 
  AND token = 'gaQt0fTyWVdP9dBYZrTb9ZrIXty8mJXw2BMR9OhNE9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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