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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cb11d67d371147ed6f9de8511a5f1cb476041c0efcf96a8d80b6548ce32c5fe' 
  AND token = 'X8tBKJCj08etE2Upj0H7eAwR4NZBFIBHHxqZLjf4exA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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