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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9064d8bbd701019631320a7088d7d9a33043d100579b90ae5b7ace24b3c34e6e' 
  AND token = 'g1srfxGDvyxVORUqSHam0NLxa7GiyqiDE5can9tAid0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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