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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4a1e6f5486a06a9ad3f8c92683baf5609d6480a641f4170342336bdf91e4f00' 
  AND token = '/K6JFTWU3t+Nu7sLJEJNLxXK1lqm0HXx3mK4BEazje4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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