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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b47031f7c7fb4f7550df0c5710cfc3f5d79868dbdb7af747904cbe174469320' 
  AND token = 'Wjo+voVUYdi4hRm3afsJsL/cNjdwyWp260ct329docg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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