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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f77e8c776c5e47defcef0fd78ecec5427661f928d6283ff855313e890b5fca6' 
  AND token = 'WQy4q2zV+AmibKkH4R339+5fSwxlBUqB5QC/AINGWdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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