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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fbadd002cc717f794fef2b0eeeb0e3a9e73620ad9ed18396e477d76fa54c3a0' 
  AND token = 'MMasQRsomkf7p3Pa0usuJxdtes+Sg+ynF48eEf97c3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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