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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b09e7ca2e18504b9436425791dd9b39dd36d4744030ed5228c5c0f4d69cde8b' 
  AND token = 'ZLcmUyRWVRVMkDcDEQIptDfuyvjPCWdVBe2/0AnfOhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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