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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf3e0caebc8a1db9aa32430ef52d8144f1b4ab8a7a5cd09884a42e33665fc128' 
  AND token = 'wajaJvzhdXuvihBR8G6eY8EPd4BmyQdp8mc6TsE1sP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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