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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5609ca8908ae9b60c2b8b269fc7d9c25d2f5b27d9adafd64f7f47fac0c0b89f' 
  AND token = 'tgm78LZLbV4ptZxNzIOGShiEEIjsI9LzM2PJlAxjQEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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