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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1980263e78311629c72fa1233d53078b5b352063412e16209b07ac62789d8d7' 
  AND token = 'UCCUMHoBL6KTL2Un6eM/fk3nIYtGQK0J3gZGBidCXI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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