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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c30081fdd667cbac47223825f6d610c1c86589cce0737d7785e9eaed7e927d7' 
  AND token = '1gvsdyQ+2NrcUILgVF5yfScGNAXGiwow2acGoKbV/3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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