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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb26811fcbe3701865ccc0fe709f93bebb5e2f1a4f79b54ea43132b5b3e159b8' 
  AND token = 'XRc0Qqww69I6/tABYFFsHncAc0hOfYp/nRrvu1uISH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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