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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f85bdbf84f9b1d7694a5a4d966945389241effc93522ad2660a3cb01aed8b956' 
  AND token = 'Y3UXpvoTZgXgmJdZe3bRg6sSEZ8+W7af7svvuEvWlJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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