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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96b262b0462ce8b42912bd3cc5fdf65d946e69b9f185a8b64bf8e992b9d5d7ca' 
  AND token = 'y7/RclnrjexI75DAYsuEUSYyGY1YDhmJl95SlxqUhpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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