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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f4d65b1ff9ba6c80f860096ba8961712cd044931f87c918a133e05956b1ed5d' 
  AND token = '+elVeAgKSBc4znxgEILuLsSxjDOe+gqplzs4UgMz9Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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