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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '389706315161d4a722b010978ebaa9921c581287b6c22582c08a2f13ea9e8e5d' 
  AND token = '9xDkaxhMZ7uhWs1cf45GZnEII4XY54Z99eyze2ieli4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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