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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1db73525fa587e31ad12f818e6e6776fe00ebfa33947e184a40f834201be8ed1' 
  AND token = '1terzSOW4y+lA9K0ezolq0px73u66VtuRRoVK+NfCPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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