Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '504d163593385c09e2d10f4230f6d00d325a2abffa5f79066a79db0ff374f355' 
  AND token = '+yCvjeWPaEYjjst0UjRqykgeJNUIUeV3lfpjf8nxIp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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