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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55e57c79c8b8ba5dd234fd11508ad882d4471bb5941c3efd2df7fea313c03483' 
  AND token = 'PUseyPQNJDQ6pN9FosxI1Jf/xBsA2W4A3LPWqNa/u5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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