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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68b35a36a4a0e19c9e5f009722bb32e19ecadfcd8349beb95237b74c65cc33bc' 
  AND token = '+GM3ejPwzvRLHTcxFdXBAqEdvsgXXUIngTMA/bm5EwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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