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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b17e1184db43b9a511392bf21c0915e20b71fdc8e5d6dbb7feab0d5a5ee80a4c' 
  AND token = 'FkMzVeHmzv3irI09Nz+c0QaCOzRtJ+aU3efgarJg1UI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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