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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fa8d5bcf29b205543455f61c4cd9a78e2ce81a377c66a66f364846ab28face6' 
  AND token = '41uIyhHkKpd5n9TnH+R8lwRYtSqhKns3LYiMVFIv54Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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