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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11d17ce49d4dad7744af6ec3d5418ddb67377791818098acc2094fc67163d717' 
  AND token = 'TIG1Ki/FevBkAe0KWxCBvAQ6x7JWDGVc1pO1EhCdC2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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