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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60da49ed8ce32b15a254506bbe01f9396858af82588ad14a8cadf78d0c841fcb' 
  AND token = 'sUtluXRm51jut4SIgFYQGbP9kwCZ/WLyo9MAJJm+i18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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