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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1f3ebc6c2e549c256073c9657aeb795843b7e4450d2f8962814d5dfcc02f5e8' 
  AND token = 'm/9tvKCvw5AsL59T0oHSLydEAw187tHzNwAWM/Loa8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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