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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41fa292823aa756e28b303d48c2c22c1ad022f9d23acf502de5d72fc5b538aca' 
  AND token = 'nhYfUJ1v4micPpXRY0h7Z+uofQJlzq4FjRFezekY9zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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