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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33ed0d10a7dd5fe1f341326dc7bb18549e8779ee6f730f61968e7ceb9e620e7b' 
  AND token = 'XjdRd0K36OZJd672zT6iUCUaF3/AsVgxTrRFznz7LO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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