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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfb4c258c5ae67ab4c884c17c88b21cb2332e041617a603346bd1e557db758ab' 
  AND token = 'qaubd2zvo6WG8YHTqLp7VOrWpFnR/8sdYSC8E17nBMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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