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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '862cc96f92515263dd8417af6ae489a4d0b62e0e6e8eebbf73038cc3753c05b0' 
  AND token = 'L5cY7wDDP6wDBOYOcJOnQHAw7XAUeNht3D2NsFuTss8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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