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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfc8e34545dbffae019d0e3d5b018993c60dcae74741d252dc356781c7607ef3' 
  AND token = 'WtBYnv95ujt7zWeIHj6PshfyX0yRgMynshwiB3qYCSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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