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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '030a5729f17aa431975a5fb18d7fcd27c3b1eebea3cfc0ca89394fd93a5a1501' 
  AND token = 'Ov41Rbxv7yDlj6MLFYjOTI6D+94rPf/DLmQoOF1QBic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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