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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71fd3b1fb3985daf814f635ca74a850bfc8a1298c2552a016b9634e1a0d1bf4b' 
  AND token = 'Ck28h/2vZHP41g/sbByrmLyQzZtTbB5c6eZF4W8BHxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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