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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be43bb1305c907161b07909761f6b84195ae411132058df7e6c8d08eca6490f8' 
  AND token = '/gXy5GC8ui1DRQ9ct56dRw4HqMwErYSt9iBK67fKhnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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