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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77ea281fafebab6ace8b8725bb5a8281e9025564ec2828b30581948c5267e5ef' 
  AND token = 'R1y/YTyn5ACnEXO9rNsK3Es/VlAeBuELfNuiA45b0lY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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