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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff69fba4fa4365f8fa602b7878819dabd7b2cc7edc0c87013bb39e829f519ed8' 
  AND token = 'kApLLr7082DfqrawNBhX0czxdgi44RzJrM1yVuhw4nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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