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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ee98d1de426e72c491a80c1a5e7dbaa14e8e760dfc0515f1d907488e8557f98' 
  AND token = 'Gz4BXgNwO74DeNN0wv5GNgNdApz36puw1odGRkpJOhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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