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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56913886f45d1252aa05de86c129b02699b7dfe61b61b6e3c841920811ba0957' 
  AND token = 'AHR8k/vZo6FWxQv9NFYgPdWPOunpPQHZD85ymB5hSlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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