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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f6279b55b30e20590093c08ce224b26277c82ea1e7d70f18bcaed292b1e108c' 
  AND token = 'RXfRN/dICFVxbzXt4o87ITa3M7/k4dgW0ouKn5Rmj94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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