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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5e3b7ac4e18f5803569e001b4e73270fb3a42b9b1173ac7291ea815bac0c9ed' 
  AND token = '9ob2708jaaw6nx2SFjhjcbKOvqsh45r0Fre7vd57maQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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