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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '835b14ba6691127350a3254cd3c9a8db8ede55ba299e6b717b55dacc96f48655' 
  AND token = 'gQ0q5EOAj4B4dDInSPqJe6btKTdmqhH4P/lKrEACM7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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