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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6214cd13a8939a36ab820d994782a02d218671da6378b0bda3c5f95304f550a1' 
  AND token = 'NfkS8h+fWrr3hvNP28CKrznXdbRSbLj/Gb7kUFUBOnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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