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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6933d144f9924058fea78d49901c525a99be07b9e0e56a8773fbe2ab99b2ab02' 
  AND token = 'RoqozfOCkkUcYM2esL5MI8WCO68eL7PSTFeZSFeBB8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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