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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb4d8f84e5b592a7bab9a491ff404854d18003e964eba510a650877a29cfbafd' 
  AND token = 'FTUnqxVcp9/uisi7f6GUg9ru3/QHbsnKmfWdW9xj39w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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