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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f06fe1621db226777e2d54de2c650be41763c3ea27e516144319871d4b6ec31' 
  AND token = '8Sf0QY5JPXtfjjZUKhWnxI9crnfk02PcGIJxbX/4FOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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