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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59bde4c75dd12bde520754d8236d8322f09fee9f662beacdd4ed54754ec71f11' 
  AND token = 'jtJCFc80XHZR06QI97l9Zlwn3rSNUI6MZqwKGRg2E8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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