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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfc5628ecb2346a13675595c02bc598b04a20a85cd8ea542d335bf28ad0f9d3d' 
  AND token = '21hnrL7j8dSIWPxdHMelyAwUDa3yMAd1NEmUd0HvC7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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