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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '341379d319bcb7e2f4540c16198f3b455908eda75490f6d1bb418a6cc198ebb7' 
  AND token = 'mbU6BTqgjPJ8XcEGT0U1WFd7Z66eWIMJG+ecGd/XQTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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