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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06cd346989b0484cfd85f74a9c184fcdafd59518e4e8c4b1132aad02f58fa400' 
  AND token = '+NlNFxMJM33xVcvtFMcRpxtDHWSs7rJ2oYM/SPx9XuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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