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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd7f7d576f66de4a83b8eccdd4486603eba88b35107d5f7b5ca094a9f2a0fdc9' 
  AND token = 'n1Oilgy5CEh4CkYZVdRXBpT7NZuq8gpyBLDEl2l4XY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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